package com.sky.service.impl;

import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.baomidou.mybatisplus.extension.toolkit.Db;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.MyEnum.MessageEnum;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.Employee;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.EmployeeMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.time.LocalDateTime;
import java.util.List;
import java.util.Optional;

/**
 * 分类业务层
 */
@Service
@Slf4j
@RequiredArgsConstructor
public class CategoryServiceImpl  extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    private  final CategoryMapper categoryMapper;
    //可能存在循环依赖的风险
    private final DishMapper dishMapper;
    private final SetmealMapper setmealMapper;

    /**
     * 新增分类
     * @param categoryDTO
     */
    public void save(CategoryDTO categoryDTO) {
        Category category = new Category();
        //属性拷贝
        BeanUtils.copyProperties(categoryDTO, category);
        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE.getNum());
        //入库
        categoryMapper.insertByCategory(category);
    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {

        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());

        //下一条sql进行分页，自动加入limit关键字分页
//        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);

        //MP代替分页查询
        Page<Category> page = new Page<>();
        page.addAll(lambdaQuery()
                .like(StrUtil.isNotEmpty(categoryPageQueryDTO.getName()), Category::getName, categoryPageQueryDTO.getName())
                .eq(null != categoryPageQueryDTO.getType(), Category::getType, categoryPageQueryDTO.getType())
                .orderByAsc(Category::getSort)
                .orderByDesc(Category::getCreateTime)
                .list());

        return new PageResult(page.getTotal(), page.getResult());

    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
//        Integer count = dishMapper.countByCategoryId(id);

        //使用mp代替-使用Db工具类防止引入其他类的依赖。避免循环依赖
        long count = Db.lambdaQuery(Dish.class).eq(Dish::getCategoryId, id).count();

        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageEnum.CATEGORY_BE_RELATED_BY_DISH.getExplain());
        }

        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
//        count = setmealMapper.countByCategoryId(id);

        //同上
        count = Db.lambdaQuery(Setmeal.class).eq(Setmeal::getCategoryId, id).count();

        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageEnum.CATEGORY_BE_RELATED_BY_SETMEAL.getExplain());
        }

        //删除分类数据
//        categoryMapper.deleteById(id);
        removeById(id);
    }

    /**
     * 修改分类
     * @param categoryDTO
     */
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO,category);
        categoryMapper.update(category);
    }

    /**
     * 启用、禁用分类
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        Category category = Category.builder()
                .id(id)
                .status(status)
                .build();
        categoryMapper.update(category);
    }

    /**
     * 根据类型查询分类
     * @param type
     * @return
     */
    public List<Category> list(Integer type) {
        return categoryMapper.list(type);
    }
}
